<template>
    <div class="grid grid-cols-2 h-screen">
        <!-- 默认占两列，order 用于指定排列顺序，md 用于适配非移动端（PC 端） -->
        <div class="col-span-2 order-2 p-10 md:col-span-1 md:order-1 bg-slate-900">
            <!-- 指定为 flex 布局，并设置为屏幕垂直水平居中，高度为 100% -->
            <div class="flex justify-center items-center h-full flex-col animate__animated animate__bounceInLeft animate__fast
">
                <h2 class="font-bold text-4xl mb-7 text-white">KnowledgeHub 登录</h2>
                <p class="text-white">一款由 Spring Boot 3 + Mybaits Plus + Vue 3 开发的前后端分离的个人知识库管理系统。</p>
                <!-- 指定图片宽度为父级元素的 1/2 -->
                <img src="@/assets/developer.png" class="w-1/2">
            </div>
        </div>

        <div class="flex flex-col col-span-2 order-1 md:col-span-1 md:order-2 bg-white dark:bg-gray-800">

            <!-- 黑夜白天开关 -->
            <label class="switch ml-auto mt-4 mr-4">
                <input type="checkbox" v-model="isLight" @click="toggleDark()">
                <span class="slider"></span>
            </label>

        	<!-- flex-col 用于指定子元素垂直排列 -->
            <div class="flex justify-center items-center h-full flex-col animate__animated animate__bounceInRight animate__fast
">

                <!-- 大标题，设置字体粗细、大小、下边距 -->
                <h1 class="font-bold text-4xl mb-5 dark:text-white">欢迎回来</h1>
                <!-- 设置 flex 布局，内容垂直水平居中，文字颜色，以及子内容水平方向 x 轴间距 -->
                <div class="flex items-center justify-center mb-7 text-gray-400 space-x-2 dark:text-gray-500">
                    <!-- 左边横线，高度为 1px, 宽度为 16，背景色设置 -->
                    <span class="h-[1px] w-16 bg-gray-200 dark:bg-gray-700"></span>
                    <span>账号密码登录</span>
                    <!-- 右边横线 -->
                    <span class="h-[1px] w-16 bg-gray-200 dark:bg-gray-700"></span>
                </div>
                <!-- 引入 Element Plus 表单组件，移动端设置宽度为 5/6，PC 端设置为 2/5 -->
				<el-form class="w-5/6 md:w-2/5" ref="formRef" :rules="rules" :model="form">
                    <el-form-item prop="username">
                        <!-- 输入框组件 -->
                        <el-input size="large" v-model="form.username" placeholder="请输入用户名" :prefix-icon="User" clearable />
                    </el-form-item>
                    <el-form-item prop="password">
                        <!-- 密码框组件 -->
                        <el-input size="large" type="password" v-model="form.password" placeholder="请输入密码"
                            :prefix-icon="Lock" clearable show-password />
                    </el-form-item>
                    <el-form-item>
                        <!-- 登录按钮，宽度设置为 100% -->
                        <el-button class="w-full mt-2" size="large" :loading="loading" type="primary" @click="onSubmit">登录</el-button>
                    </el-form-item>
                </el-form>
                
            </div>
        </div>
    </div>
</template>

<script setup>
// 引入 Element Plus 中的用户、锁图标
import { User, Lock } from '@element-plus/icons-vue'
import { login } from '@/api/admin/user';
import { reactive, ref, onMounted, onBeforeUnmount } from 'vue';
import { useRouter } from 'vue-router';
import { showMessage } from '@/composables/util';
import { setToken } from '@/composables/cookie';
import { useUserStore } from '@/stores/user'
import { useDark, useToggle } from '@vueuse/core'

const userStore = useUserStore()
const router = useRouter()
const form = reactive({
    username: '',
    password: ''
})
// 表单引用
const formRef = ref(null)
const loading = ref(false)
// 表单验证规则
const rules = {
    username: [
        {
            required: true,
            message: '用户名不能为空',
            trigger: 'blur'
        },
        {
            min: 3,
            max: 10,
            message: '用户名长度应该在 3 到 10 之间',
            trigger: 'blur'
        }
    ],
    password: [
        {
            required: true,
            message: '密码不能为空',
            trigger: 'blur',
        },
        {
            min: 3,
            max: 10,
            message: '密码长度应该在 3 到 10 之间',
            trigger: 'blur'
        }
    ]
}
// 登录
const onSubmit = async() => {
    console.log('登录')
    const valid = await formRef.value.validate().catch(() => false);
    if (!valid) {  
        showMessage('表单验证不通过', 'error')
        console.log('表单验证不通过')
        return false
    }


    try{
        // 开始加载
        loading.value = true        
        const res = await login(form.username, form.password)
        console.log(res)
        if(res.success == true) {
            // 提示登录成功
            showMessage('登录成功')
            // 存储 Token 到 Cookie 中
            let token = res.data.token
            setToken(token)

            // 获取用户信息，并存储到全局状态中
            userStore.setUserInfo()
            // 跳转到后台首页
            router.push('/admin/index')
        } else {
            // 获取服务端返回的错误消息
            let message = res.message
            // 提示消息
            showMessage(message, 'error')
        } 
    } catch(err){
        showMessage(err.message, 'error')
    } finally{
        loading.value = false
    }
    
}
// 是否是白天
const isLight = ref(true)
const isDark = useDark({
  onChanged(dark) {
    // update the dom, call the API or something
    console.log('onchange:' + dark)
    if (dark) {
        // 给 body 添加 class="dark"
        document.documentElement.classList.add('dark');
        // 设置 switch 的值
        isLight.value = false
    } else {
        // 移除 body 中添加 class="dark"
        document.documentElement.classList.remove('dark');
        isLight.value = true
    }
  },
})
const toggleDark = useToggle(isDark)
// 按回车键后，执行登录事件
function onKeyUp(e) {
    console.log(e)
    if (e.key == 'Enter') {
        onSubmit()
    }
}
// 添加键盘监听
onMounted(() => {
    console.log('添加键盘监听')
    document.addEventListener('keyup', onKeyUp)
})
// 移除键盘监听
onBeforeUnmount(() => {
    document.removeEventListener('keyup', onKeyUp)
})
// const onSubmit = async() => {
//     const res = await login(form.username, form.password)
//     console.log('登录');
//     console.log(res);
//     if(res.data.success == true) {
//         router.push('/admin/index')
//     }
    
// }

</script>
<style scoped>

/* The switch - the box around the slider */
.switch {
  font-size: 14px;
  position: relative;
  display: inline-block;
  width: 3.5em;
  height: 2em;
}

/* Hide default HTML checkbox */
.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

/* The slider */
.slider {
  --background: #28096b;
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--background);
  transition: .5s;
  border-radius: 30px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 1.4em;
  width: 1.4em;
  border-radius: 50%;
  left: 10%;
  bottom: 15%;
  box-shadow: inset 8px -4px 0px 0px #fff000;
  background: var(--background);
  transition: .5s;
}

input:checked + .slider {
  background-color: #522ba7;
}

input:checked + .slider:before {
  transform: translateX(100%);
  box-shadow: inset 15px -4px 0px 15px #fff000;
}

</style>
